"May saw two new entries at the top of the chart - Sobig-B and
Fizzer," said Graham Cluley, senior technology consultant at Sophos
Anti-Virus. "Disguised as a message from Microsoft technical
support, Sobig-B spreads quickly via email and network shares.
Fizzer, meanwhile, exploited email and the KaZaA file-sharing
network. Both of these prove that it isn't enough just to block
your email gateway - companies should ensure the virus protection
on their desktops is automatically updated."

Sophos detected 611 new viruses, worms and Trojan horses in May.
The total number it now protects against is 82,048.

"A chain letter claiming to offer a free Nokia mobile phone has
stormed to the very top of the hoax charts this month," said
Cluley. "The Nokia Giveaway chain letter has even managed to topple
JDBGMGR, one of the most persistent hoaxes of all time."

Sophos has made available a free, constantly updated information feed for intranets and
websites which means users can always find out about the latest
viruses and hoaxes.

About Sophos

More than 100 million users in 150 countries rely on Sophos’ complete security solutions as the best protection against complex threats and data loss. Simple to deploy, manage, and use, Sophos’ award-winning encryption, endpoint security, web, email, mobile and network security solutions are backed by SophosLabs - a global network of threat intelligence centers. Sophos is headquartered in Oxford, U.K., and is publicly traded on the London Stock Exchange under the symbol “SOPH.” More information is available at www.sophos.com/company.